Monitor-lathe spindle and chuck construction.



4 E. J. MGCLELLAN. MCNITOE LEHE SPINDLE AND CHUCK CONSTRUCTION.

APPLICATION FILED JULY 22, 1908.

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.EL L MGCLELLAN.

HNITOB LATH SPINDLE AND CHUCK CONSTRUCTION.

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J. MGGLELLAN.

MNTOR LATHB SPINDLE AND CHUCK GOSTRUGTION.

APPLOATIOH FILED JULY 22. 1903. www ,f @i ff a brake thereto.

UNITED sTATEs PATENT oEEroE.

EDWARD J. MCCLELLAN, OF NEW YORK, N. Y., ASSIGNOR TO THE GARVIN MA CHINE COMPANY, A CORPORATION OF NEW YORK.

MONITOR-LATHE SPINDLE AND CHUCK CONSTRUCTION.

Specification of Letters Patent.

Application led July 22, 1908.

Patented July 6, 1909.

Serial No. 444,719.

To all whom it may concern:

Be it known that I, EDWARD J. MC- OLELLAN, Aa citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain nev\T and useful Improvements in Monitor-Lathe Spindle and Chuck Construction, of which the following is a full, clear, and exact description.

lvly invention relates to a spindle and chuck construction for a monitor lathe, the principal object being to provide a spindle and chuck adapted to operate with work. of irregular shapes as well as ordinary centered or concentric work. These characteristics are, of course, in addition to the usual requisites of a monitor lathe, that is to say, the quick engagement and disengagement of the work by the movement of a single lever or part after the initial adjustments have been made.

From another aspect my invention consists in the provision of means for simultaneously releasing the chuck, disengaging the spindle from its driving means, and applying It is evident that in this aspect the invention is not dependent on any particular kindof chuck used.

From still another aspect, my invention consists in the construction by which all the above mentioned functions are obtained through the axial movement of the lathe spindle and its associated co-aXial parts. Allr of these movements are impelled from a single operating tube within the spindle, and which may be termed a draw tube. This draw tube is connected to operate the chuck in whatever initial adjusted relation the latter may be put, either' for clamping work internally or externally, and in any possible eccentric or concentric relation.

My invention also includes certain features of adjustment by which the mechanism is maintained at perfect efliciency to exercise its functions regardless of wear of the parts.

With these and other objects in view, the invent-ion consists in the features of' construction and combination, as hereinafter set forth and claimed.

In the drawings: Figure 1 is a side elevation of a monitor lathe spindle and chuck embodying the principles of my invention Fig. 2 ijs a longitudinal sectional View of the same; Fig. 3 is a detail View partly in section showing the chuck and certain features of the .driving clutch; Fig. 4 is a face view of the surfaces E) chuck; and Fig. 5 is a side view of the same partly in section showing a different arrangement of the jaws.

Referring to the drawings in which like parts are designated by the same reference sign,\1 indicates the lathe spindle, and 2 a face plate threaded onto the nose thereof in the usual way.

3 designates what I have termed the draw tube, and 4 what I shall term a draw plate threaded to the end of the draw tube at 5,V

and movable axially within the face plate 2 through a limited range.

6 designates jaw supporting blocks, eachof which is guided to have a radial movement on the face plate 2. For this purpose the face plate has radial undercut ways or guides 7, in which said blocks 6 are accurately receivedand guided. Each jaw supporting block 6 has a transverse recess 8, one face 9 of which is inclined with respect to the radial path of movement of the block.

10 designates wedges fastened to projectingl portions 11 of the draw plate 4, by means of the nuts 12, said wedges having slightly tapered portions 13, which are tightened in corres ondingly formed holes of the draw plate y said nuts. Each wedge. 10 has a face 15, corresponding in inchnation to the face t) already described. The o posite side 16, of the wedge may be paral el with its direction of motion.

17 designates blocks fastened within the face plate 2 by screws 1S, and which have faces 19, parallel to the faces 16 of -the wedges 10.

'20 designates balls or rollers interposed between the faces t) and 1 5, and 16 and 19 respectively. 'lhese balls or rollers consti* tute. anti-friction means to permit a free endwise movement of the wedges through the blocks 6. lt .is evident that when the draw tube 3 is pulled inward into the lathe spindle, that the wedges 1() will be drawn to the left in the figures of thc drawing, thereby impelling the jaw supporting blocks 6 inward, b v virtue. of the cooperating wedge and 15. In this action the wedges are supported against yielding outwardly by the abutments formed by the surfaces 19, together with the adjacent balls or rollers 20. When the draw tube is released and the draw plate 4 moved to the right in the drawing, the jaw supporting blocks 6 are correspondingly cased or reyleased. In practice I provide means for ositively impelling the jaw supporting Iilocks outwardly when they are eased or released from the work.4 For this purpose each wedge 1() has a groove 24, on the face 16, the bottom of which is inclined in a direction parallel to the `wedge 15.

25 designates a pin forming 'part of the jaw supporting block 6 and riding in the groove 24, so as to engage the bottom surface thereof. It is evident that when the wedge moves to the right in the drawings, the pin 25 will be impelled outwardly, thereby correspondingly moving its block 6 to release the work.

26 designates the jaws proper, of which a number of different kinds are provided, interchangeably attachable upon the jawsupporting blocks 6. Not only are there rovided diierent kinds of jaws 26, but each jaw is attachable u on its supporting block 6 in dierent radia ositions and endwise reversed relations. also provide means for making a iine adjustment of the jaws u on their supporting blocks, and holding lt e jaws in any particular relation with adequatev security; The jaw 26 has a iiat supporting portion 28, with elongated slots or oles 29, on either side thereof. Each jawsupporting block 6 has a series of threaded holes 30 on each side adapted to register with the slots 29 of the jaw member.

p 3l designates screws adapted to be received in the threaded holes 30 through the slots 29. It is evident that by engaging the screws 31 in selected holes of the series on the supporting blocks 6, that the jaw members can be fastened in various dii'ierent radial positions on their supports 6. Not only can the jaws be fastened in different radial positions on their supports, but each ljaw is capable of being reversed end for end, which gives a still further range of effective positions.

It will be observed by reference to Fig. 4 that I have devised two different kinds of jaws, of which one (designated A) has its work engagin portion 27 near the end of the plate 28, wh' e another type designated B as the work engaging portion' 27" near the center of the plate 28. One of the jaws of type A is shown with its engaging portion 27 turned inward, while the other 'jaw of gpc A has its engaging portion outermost.

course diierent types of jaws, or dierent arrangements of type A jaw can be employed simultaneously, as in Fig. 4, on ir- 'rrlegular work, or the jaws can be symmetricy arranged in the chuck for concentric work of widely varying diameters.

The jaws are positioned on their su portin blocks 6 in approximately the esired re ation, but it is evident that they are capable lof a limited radial movement for the length of the slots 29, through which the screws 31 are received. In order to make this adjustment and lock the jaw in any particular relation, I provide an externally threaded cylinder 33 inclosed between an internally threaded recess 34 of the plate 28, and. an internal cylindrical cavity 35 of the block 6. The size and relation of the surfaces 34 and 35 are such as to snugly receive the threaded cylinder 33 between them, with the threads of said cylinder in mesh with the threads of said recess 34. The cavity 35 in the block 6 has a limited longitudinal eX- tent corresponding to the length of said cylinder 33, so that the latter is maintained in a predetermined radial relation on said block. Under these circumstances a radial movement is imparted to the plate 28 and the aw 26 by turning said cylinder 33. The cylinder 33 can be turned by the insertion of any suitable non-circular rod or key in an opening 36 of corresponding shape in the end o the cylinder. The internally threaded recess 34 of the plate 28 extends from end 'to end thereof, so that a properly meshing engagement may be made for any position which the jaw may have upon its supporting block. Each jaw may be finely adjusted by turning the threaded cylinder 33 thereof, and when the jaws are correctly positioned for a articular kind of work, they are tightened y setting the various screws 31.

. I have referred to the fact that the chuck is equally o erable to grasp work internally and rearranged. For this purpose the face plate 2 is made with a removable back plate 40, securedto the main port-ion of the face plate by the screws 41. The main body 2 of the face plate is open at the rear opposite the points of the draw plate 4 which support the wedges 10. Accordingly if the wedges 10 are loosened from the draw plate 4 by the removal of the nuts 12, it is possible to Withdraw the draw plate 4 out of the face late 2 through the rear open side thereof. Ihe jaw su porting blocks 6 can then be passed radia ly inward on the face plate and removed. Abutment blocks 17 are next taken out by releasing the screws 18. The parts are then rearranged, as shown in Fig. 5, with the wedges 10 reversed upon the draw lat-e 4. Instead of blocks 17, a ring 42 is astened to the draw plate 4 by screws 43, and serves as an abutment for the wedges 10 to prevent their yielding inwardly. The jaw supporting blocks 6 having been reinserted in the face plate in reversed relation, it is evident that their surfaces 9 are in position to cooperate with the inclined faces 15 of the wedges, there being the usual balls or rollers 2() interposed to provide an antifriction engagement. The jaws may be as- 'sembled upon the supporting blocks in exv.

Idirectly engages the spindle, but at the bearing 51 there is an intermediate sleeve 52, which revolves with the spindle and fur- Inishes the bearing surface therefor, as will later more fully appear.

53 designates a collar upon the sleeve 52, and vthis collar is fixed to and made rigid with the draw tube I), by the connecting screw or pin 54, which passes through an elongated slot 55, in the sleeve 52, and an elongated slot 56 in the spindle. By this construction the collar 53 is made a part of and moves with the draw tube under all circumstances, and at the same time all of these parts, including the collar 53, the sleeve 52, the spindle 1, and the draw tube 3, are constrained to rotate together. ',lhe draw tube is, however, ca able of a certain longitudinal movement within the spindle, limited by the extent of'the slot 56'. At the same time the draw tube is longitudinally movable with respect to the sleeve, 52 and the latter is longitudinally movable with respect to the spindle. These relations constitute an important part of my invention and secure a variety of functions, as will later more fully appear.

58 designates a collar fixed to the extreme rear end of the draw tube 3, and 59`indicates another collar forming part of the sleeve 52. Between collars 58 and 59 I provide a strong spiral compression s ring 60, which constantly presses the col ar 58 to the left in the drawings and impels the draw tube inward in the s viindle, so that it tends to tighten the jaws ol' the chuck. This spring impelled movement continues, of course, until the `jaws engage the work or reach their limit of movement, unless said spring impelled movement is resist ed at an intermediate point ol' its range in some other way. In the above statement the collar 5S) has been considered as if fixed to the spindle. As a matter of fact, the collar 59 is not fixed to the spindle, but forms a part of the sleeve 52 thereon. \In the normal operation of the lathe, however, the sleeve 52 becomes fixed in a predetermined relation upon the spindle, so that the collar 59 is virtually a part of the spindle when the lathe is running.

I will now consider the means by which the sleeve 52 attains a fixed relation on the spindle when the lathe is running.

65 designates a cone pulley loose upon the s )indle 1 between the bearings 50 and 51.

lT Ihe largest cone pulley has an internal con- `ical surface 66, forming the driving member of a friction clutch.

67 designates the other clutch member having an external cone surface 67 to engage the surface 66. The clutch member 67 is rigidly iixed to the spindle l by the set screw 68. To absolutely insure against the clutch member 67 being displaced upon the spindle, I shoulder the latter at 69, adjacent to clutch member 67. A thrust bearing is provided to prevent longitudinal dis lacement of the cone pulley 65 to the right .1n the drawings, but this thrust bearing is not effective to prevent a movement of the spindle and clutch member 67 to the right. lfor this pur ose I provide a plurality of pins 70, preferab y of hardened steel, loosely re ceived in holes through the clutch member 67 in an axial direction.

7l and 72 designate collars or bearing surfaces lying against-the bearing and the cone pulley respectively. The ends of the pins 7 0 abut against the collars 71 and 72 under all circumstances, and prevent said cone pulley from moving to the right. But the loose engagement of these pins in clutch member 67 permits a longitudinal movement of the latter', and it is evident that the pins are free to revolve with said clutch member with a continuous bearing engagementbetween or with collars 71 and'72, so that the cone pulley may revolve independently of the `spindle or vice versa.

By the above mechanism, the clutch. member 67 is disengaged from the cone pulley by moving the s indle to the right in the bearings, after wliich the cone pulleys may revolve independently of the spindle. At the other end a thrust bearing or abutment is provided for the cone pulley 65 by a collar 74, mounted on the sleeve 52. 'lhe collar 74 is adjustable longitudinally on said sleeve by means of a backing nut 75, which surrounds and is engaged upon a threaded portion of saidsleeve. The collar 74 has a key engagement 76 with said sleeve 52, so, that it cannot be turned on said sleeve and exert a force to tighten or loosen said nut 75 thereon.

The fact has already been referred to that the spring 60 exerts its force in both directions, so that its tension 'is constantly exerted against collar 59 and the sleeve 52 of which said collar forms a part. As the sleeve 52 has a thrust bearing or abutting engagement with cone pulley 65, through the collar 74, it follows .that said cone pulley may be pressed to the right, either until its movement is limited by the engagement of the clutch surface 66 67, or insome other way. As the clutch member 67 is firmly engaged when the lathe is running, it takes up said thrust of said spring 60, which therefore exerts the useful function of keep-A ing the clutch in engagement. From another aspect, it may be stated that when the lathe is running and the chuck is tight upon the work, the draw tube pulls the spindle to the left with all the force of said s ring 60, which pressure of the spindle to t e left is exactly resisted and neutralized by the engagement of the clutch surfaces 66,67 impelled by sleeve 52 through the reaction of said spring 60. When the lathe, therefore, is running normally, everything is tight about the spindle and its rotating parts, the chuck being engaged in the work, and the clutch surfaces 66, and 67, being tightened with the full effective `pressure of the spring 60. lt will be seen that the bearings 50 and 51 take no part in the forces of transmission and reaction, as above described, so that the spindle is perfectly free to revolve in said bearings.

I wil now describe the means by which the chuck jaws are released and the clutch surfaces 66 and 67 disengaged.

80 designates a collar loose on the sleeve 52 and located directly behind collar 53, and capable of having anendwise abutting engagement therewith through an intermediate washer 81 of anti-friction material. The collar 80 has trunnions 82, which are embraced and engaged'by a bell crank lever 83, having a depending arm 84, which can be moved by a foot treadle, or in any desired wa When the lever 84 is movedA to impel col ar 80 to the right in the drawings, it is evident that said collar abuts against and correspondingly impels the collar 53 to the right. As the collar 53 has been described as fixed to the draw tube throu h the pin 54, it is evident that the draw tu e will be moved to the right and the chuck jaws released from the work. .Before the draw tube can commence its movement to the right to loosen the chuck jaws, however, the force of the sprin 60 against collar 58 must be overcome. his s ring pressure has hitherto been effective while the lathe was running) to impel said draw tube and the lathe spindle to the left and keep clutch surfaces 66 and 67 in engagement. Accordingly the movement of the lever 84 has exi erted two functions: Afirst counteracting the said tension of the s ring 60 which had previously kept both t e chuck jaws and the clutch surfaces 66 and 67. in engagement; and, second, positively moving the draw tube 3 to the right, so as to separate the chuck jaws from the work. At this time the clutch surfaces 66 and 67 may or may not continue in engagement. There is no force tending to either engage or to separate them at this time. As the lever 84 continues to move and the draw tube 3 to be impelled to the right, a condition eventually occurs where the chuck jaws are expanded as much as possible, and the pin 54 hasl traversed the entire length of the slot 56 in the spindle. A still further movement `of lever 84 thereai. v t eaaeae fore causes the pin 54 to impel the spindle to the right, carrying the clutch member 67 and positively disengaging the clutch surfaces" 66, and 67. The two functions have now been attained, of first releasing the chuck from the work and separatin the jaws thereoffand second releasing the c utch surfaces 66 and 67 and separating them. From the very inception of movement of the lever 84, there has, however, been a braking force exerted to sto the rotation of thespindle.

rlhis braking 'orce is established through a shoulder 85, 'forming part of the sleeve 52, and immediately adjacent to the bearing 51. The fact has been `referred to that the initial movement of the lever 84 had the effect of relieving the endwise thrust of the s indle to the left which opposedand neutra ized the tension or reaction of the cone pulley 65 to the right. Accordingly the tension or reaction of said cone pulley 65 to the right under the influence of the sleeve 52 is no longer opposed and neutralized. The cone pulley acco'rdingly eases off from its abutting engagement against collar 74, and at the same time the shoulder 85 on the sleeve 52 comes into tight abutting engagement against the bearing 51 with" all the force of the spring 60. As ,thesleeve 52 is constrained to rotate with the spindle through the pin 54, it is evident that a braking effect is exerted to stop the spindle by the pressure of the shoulder 85 against the bearm 51. Three functions. are

therefore securedy the movement of the` lever 84: first, disenga ing the chuck jaws and separating them rom the work; second, disengaging and se arating the clutch' surfaces 66 and 67; an third, applying a braking pressure at the shoulder 85 tendlng to promptly'v arrest the rotation of the spin' ica s indle rotates freely, under the action. of

t e driving cone pulleys 65.

ln the above action there is' no reliance 4placed on the exact dimensionsof anypart able to wear, by which the action might be interfered with. It is, however, essentialy that the shoulder 85 should bring up against the bearing 51 before collar y74 ushes'the cone pulleys 65 tightly against t e pins 70. ln order that this latter condition may be always accurately maintained, re ardless of wear, the collar 7 4 ^is made adjusta le, as has been described. This collar is. adjusted' so as to transmit the thrust of the sleeve 52 to the cone pulley when the latter is engaged by` the clutch member 67, but this thrust is transferred from collar 74 to shoulder 85 when said clutch pressure is relieved by the movement of clutch member 67 to the right. This single adjustment is the only one which is required to be accurately maintained in practice.

What I claim, is

1. In combination with a lathe spindle having a face plate, a draw plate having wedges movable axially in said face plate, said wedges being reversible to present their working faces outwardly or inwardly, and jaws guided by said face plate and impelled by said wedges to tighten inwardly or outwardly upon the work.

2. In combination with a lathe spindle having a chuck, means movable longitudif nally through said spindle to tighten said chuck, a clutch member iixed to said spindle, a driving clutch member, a sleeve, and a pressure means actin means longitudina ly in the spindle to tighten said chuck, and said clutch members through said sleeve. A

3. In combination with a lathe spindle `having a chuck, means for tightening said chuck, a clutch driving the spindle, a sleeve, and a pressure means acting to tighten said clutch through said sleeve, and said chuck through said means simultaneously.

4. ncombination witha lathe spindle having a chuck, a drawtube for tightening said chuck, a clutch for driving the spindle and tightened b the longitudinal displacement thereof, bra e surfaces for stopping the rotation ofthe spindle, and a spring displaced at4 one endby said draw tube and cooperatingv with one of said brake surfaces at the otherl end to tighten said chuck and said clutch `when said draw tube is free, and to engage said brake surfaces with its full el'l'ective pressure when said draw tube is displaced to release the chuck.

5. In combination with a lathe spindle, a clutch for driving said lathe spindle, a stationary brake surface, a sleeve, a pressure means, and means for actuating said pressure means to tighten said clutch or impel said sleeve against said brake surface, as desired, with its full eil'ective pressure.

6. In combination with a lathe spindle having a chuck, a sleeve surrounding said spindle, means extending through the spin-l dle for tightening said chuck, a clutch havingdriving and drivenmembers fordriving said spindle, and a pressure means im elling said means and one member of said c utch to simultaneously tighten the clutch and said chuck.

7. In combination with a lathe spindle having a chuck, a sleeve surrounding said spindle, means extending through the spindle for tightening said chuck, a clutch having driving and driven members for driving said spindle, a 'pressure means impelling said means and one member of said clutch to sii multaneously tighten the clutch and said to impel said movable said spring.

chuck, and a device for displacin said means to release said chuck and the ot er member of said clutch.

8. In combination with a lathe spindle having a chuck, a sleeve surrounding said spindle and having a brake surface thereon, a stationary part having a coperating brake surface, means extending through the spindle for tightening said chuck, a clutch having driving and driven members for driving said spindle, a pressure means impelling said {ir-st mentioned means and one member of said clutch through said sleeve to simultaneously tighten the clutch and said chuck, and -a device for displacing said first mentioned means to release said chuck and displace the other member of said clutch, whereby an unbalanced longitudinal force is put on said sleeve to bring said brake surfaces into action.

9. In combination with a lathespindle having a driven clutch member, a cone ulley therefor having a driving clutch mem er, a sleeve movable longitudinally on said spindle and engaging said cone pulley, said sleeve having a shoulder, an abutment therefor, and a pressure means for impelling said sleeve longitudinally to tighten said clutch members, andmeans for disenga ing said clutch members whereby said shoul er operates as a brake surface.

l0. In combination with a lathe spindle having a driven clutch member, a cone pulley having a driving clutch member, a sleeve engaging said cone pulley, a draw tube within the s indle and adapted to be normally locke thereto, and a pressure means for im` pelling said draw tube and said sleeve longitudinally in opposite directions.

11. In combination with a lathe spindle having a driven clutch member, a cone pulley having a driving clutch member, a sleeve engaging said cone pulley, a draw tube wlthm the s indle and adapted to be normally locke thereto, and a s ring for im ellmg said draw tube and said's eeve longitu inally in o posite directions, and means forposb tive y moving said draw tube 1n opposltion to `12. In combination with a lathe s indle having a chuck, a driven clutch mem er on said lathe s indle, a cone pulley having a driving clutc member, a sleeve on said spm dle en a ing said cone pulley, a draw tube for saicIiuck extending through the spindle, a ressure means for impelling said draw tu e to tighten said chuck and en aging sald sleeve to tighten said clutch mem ers simultaneously, and means for positively displacing said draw tube in o posltlon to said s )ring whereby said clutc 1s released and thc pressure on said driven clutch member withdrawn whereby said clutch members are disengaged. p n

13. In combination with a lathe spindle having a chuck, a driven clutch member on said lathe spindle, a driving clutch member, a sleeve abutting against said driving clutch member to engage the same with the driven clutch member, said sleeve having a shoulder, a stationary part having a brake surface adapted to be engaged by said shoulder, a draw tube extending through the spindle for tightening said chuck, a pressure means for impellng said draw tube and said sleeve longitudinally in opposite directions and means for positively moving said draw tube in opposition to said spring, whereby said chuck is released, said clutch members disengaged, and said shoulder made to exert a braking function. A

14. In combination with a lathe spindle having a chuck, means for tightening said chuelg'a clutch for driving said s indie, a sleeve surrounding said spindle, an a preseem-ee sure means engagmg said first -mentioned means and reacting against one member of said clutch through the medium of said sleeve, whereby the clutch and chuck are simultaneously tightened.

15. In combination with a lathe headstock havin a chuck, means for releasing the work from t e chuck, a friction clutch, means for releasing the friction clutch, means for braking the rotation of the lathe spindle, and mechanism for simultaneously actuating said means.

ln witness whereof I subscribe my signature, in the presence of two witnesses.

EDWARD J. MCCLELLAN.

Witnesses:

d. T. WILLIAMS, CHAs. T. LUTHER. 

